#include "DHT.h"
#define SENSOR 15
#define RELAY 4

#define DHTTYPE DHT22
DHT dht(SENSOR, DHTTYPE);

const float triggerVal = 75.55;

float humidity;
bool lastRelayState = 0, relayState;

void setup(void){
  Serial.begin(115200);
  pinMode(RELAY, OUTPUT);
  digitalWrite(RELAY, relayState);

  dht.begin();

  Serial.println("Example State Engine\n");
}

void loop(void){
  humidity = dht.readHumidity();
  if(humidity <= triggerVal){
    relayState = 1;
  }else{
    relayState = 0;
  }
  if(relayState != lastRelayState){
    if(humidity <= triggerVal){
      relayState = 1;
    }else{
      relayState = 0;
    }
    Serial.print("Relay State Now ");Serial.println(relayState ? "ON" : "OFF");
    digitalWrite(RELAY, relayState);
  }

  lastRelayState = relayState;
}